viper06HS(primary regulation ) Loss of Regulation

[PINI BITON]

Posted on April 26, 2018 at 15:12

Hi

i working on the new project with viper06HS (115khz) -primary regulation .

i have a problem , output voltage 12 v on the second winding drop with increase current(connecting load)

when i used Light load

 the output is 12 (3mA) and when i start to increes the current (heavy load about 100mA)

the output voltage is drop to 8.5v  

the feedback is from auxiliary winding (without optocoupler)

maybe the problem is  from the 

feedback 

and when this future is available in 

eDesignSuite ?

spec:

input :90-265 VAC

output : 12v up to 200mA

Transformer 750370024:

PRI (1-3)=1.6mH �10%

PRI(1-3) = 120 turns

AUX(5-4) = 20 turns

SEC(9-6) = 15 turns

TURNS RATIO    (1-3):(9-6) 8:1, �1%

TURNS RATIO    (1-3):(5-4) 6:1, �1%

add pic(circuit and transformer )

thanks

#viper06 #flayback #psr-cv

[Emil Nierges]

Posted on June 07, 2018 at 12:20

Hi Pini,

Indeed due to primary side regulation, the transformer needs to have a strong coupling within the AUX winding  and SEC winding. It may be room for improvements  of 750370024 internal construction for better output regulation and if you are still looking for a solution feel free to contact me, maybe I can help.

Regards,

Emil